ORA-07445: exception encountered: core dump [kghlkremf+0024]

I have 10.2.0.4 2 node RAC system on AIX 6 Operating system. Node1 has been crashed wiht those error messages: Thu Jun 14 12:20:11 2012 Errors in file /oracle10g/app/oracle/admin/PROD/bdump/PROD1_s001_889010.trc: ORA-07445: exception encountered: core dump [kghsrch+0034] [SIGSEGV] [Address not mapped to object] [0xFFFFFFFFFFFFFFF0] [] [] Thu Jun 14 12:20:12 2012 Continue reading